Oil burner



May 21; 1929- E. A. FIELD ET AL 1,714,217

and Edward H. ed J/r May 21, 1929. E. A. FIELD r-:T AL

OIL BURNER Filed Aprl 20 1925 3 Sheets-Sheet 2 MayZl, 1929. E. A. FIELD ET AL OIL BURNER Filed April 20, 1925 3 Sheets-Sheet 3 E sld el Hw ,TG1 nAH ed WMM Iwm dd im Patented May 2l, 1929.

PATENT OFFICE.

UNITED STATES EDWARD A. FIELD AND EDWARD A. FIELD, JR., OF CHICAGO, ILLINOIS, ASSIGNORS TO FIELD ENGINEERING CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

OIL BURNER.

Application filed April 20, 1925.

This invention relates to improvements in oil burners. 1

The main objects of the invention are:

First, to provide an improved oil burner which may be easily installed in furnaces and in other relations where desired, and which is very eiicient.

Second, to provide an improved oil burner which is effective and does not require the use of motor power.

Third, to provide an .improved burner adapted for the burning of heavy oils and distillate which is substantially smokeless and may be readily freed from any carbon or dirt, which may be collected therein.

Fourth, to provide an improved oil burner having these advantages which is economical in its parts and may be quickly installed in furnaces of the type now in quite common use.

Fifth, to provide in connection with the burner an automatic draft regulator'.

Objects pertaining to details and economies of our improvements will definitely appear from the detailed description to follow.

We accomplish the objects of our invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure embodying the features of our invention is clearly illustrated in the accompanying drawing forming a part of this application, in which:

Fig. I is a fragmentary side elevation of a hot air furnace having our improved oil burner installed therein, the furnace being shown in conventional form for the purpose of illustrating the matter of installation.

Fig. II is a detail vertical section on a iine corresponding to line Q--Z of Figs. I and III.

Fig. III is a detail view mainly in h Zontal section on a line corresponding to line 3--3 of Fig. II.

Fig. IV is a side view of one of the inner parts.

Fig. V is a detail view partially in vertical section of the atomizing head.

VI is a fragmentary section on a line corresponding to line 6-6 of Fig. II showing details of the atomizing head spindle bearings.

Fig. VII is a detail view partially in section showin details of the fuel nozzles.

Fig. VII is a top view of the draft reguv later.

wall.

Serial No. 24,422.

Fig. IX is a detail section of the draft regulator on a line corresponding to line 9 9 of Fig. VIII.

Fig. X is a detail section of the draft regulator on a line corresponding to line 10-l0 of Fig. VIII.

In the drawing the sectional views are taken looking in the direction of the little arrows at the ends of the section lines and similar numerals of reference indicate similar parts throughout the several views.

Referring to the drawing, l represents the hot air casing of the furnace, 2 the body thereof, 3 the fire pot and 4 the ashpit. These parts are shown conventionally.

Our improved burner comprises a body consisting of a bottom member 5 havingr an inwardly converging intermediate portion 6 and a bottom portion 7 which is open with the exception of the cross piece or spider 8. The top body member 9 is provided with an outer wall 10 resting upon the upper edge of the bottom body member 5 and supported thereby, and an inner wall 1l dependingl within and in spaced relation to the outer The inner wall has opposed openings l2 therein with spaced lugs 13 above the openings. Thepurpose of the openings and lugs will appear as the description proceeds.

The top body member has opposed enlargements 9 to receive the fuel supply pipe coupling members lll. The branches i5 from the fuel supply pipe 16 are connected to the lower ends of these coupling members.

Centrally supported within the bottom body member is an inner wall bottom meniber 17 which is supported in spaced relation to the outer bottom member by the lugs 18. The inner wall bottom member is shouldered at 19 to receive the lugs and is clamped in position on the lugs b means of the screw 20.

This inner wall ottom member has a flangffe disposed in concentric relation to the side wall of the bottom member providing an annular fuel drain trough 22. This drain trough is provided with a drain pipe 24 delivering to the receptacle The inner wall bottom member 17 also has a central air opening Q6 therein,

A11 annular shaker member 27 is mounted upon the inner wall bottom member to constitute an inner wall member. This shaker member` has a flange 28 on its lower edge projecting into the member 17, this flange having slot-like openings 29 therein adapted `upon the rotation thereot to open the ports A lever 33 pivoted at 34 engages between the lugs 35 for oscillating` the shaker member.

The top inner wall men'iber 36 rests upon the upper edge ot the shaker member and is supported centrally thereof by means ot the lingers 37. This allows for the rotative movement of the shaker member.

'These inner wall members 17 27 and 3G constitute an inner all and coact with the body members and the combustion chamber wall to provide a return air passage deliver- 'ine' into the lower end otf the combustion chamber. A cover plate 38 ot general conical form is carried by the 'flange 21 of the member 17, the cover plate having a flange 39 embracing the flange 21.

A pair of annular clearance members Ll-O and 41 are arranged in superimposed relation upon the flange 28 et the member 27 coactingBr therewith. and with the cover plate 38 which rests upon the clearance member to provide a cover for the drain trough, at the same time allowing any surplus liquid Jfuel to tlow into the drain trough to be discharged as described. Any dirt. carbon or soot 'falling upon the cover plate or from the combustion chamber is directed outwardly upon the clearance members and through the openings 29 upon the actuation ot the shaker. These clearance members are supported tor independent rotative movement and the return of the shaker to its initial position, owing,r to the :tact that the members merely rest upon each other and their inertia and ditterence in 'friction between them. tends to cause these members to rotate relative to each 'other and to the tlanc'e 28. thereby freeing the same ot any* collection of carbon or dirt and `jarringr it loose so that it is discharged through the openings 29.

le provide a spra;Y head consi sting ot' the head. member l2 having4 depending lugs 4113 upon which the radial arms 44; are carried, these arms 414 having an annular atomizing plate il5 mounted thereon. The plate has 'tanlike blades t6 .formed in its outer edge. The outer ends 47 of the arms 44 are turned upwardly to support the rim 4.8 in the plane of the atomizineplate.

A baille plate 119 is mounted upon the head member 4-2 so that air flowing through the atomizing plate is directed outwardly by this battle plate. rlhe aton'iizing bead is supported by the spindle 50 having a notch 51 in its upper edge adapted. to engage the cross pin 52 in the tubular shank 53 of the atomizing head, therel'iy rotatably connecting` the head to the spindle but permitting its being litted from the spindle as occasion requires.

rlhc spindle is provided with an end bearing member 54 havingv a spherically curved end portion. coactinp' with the bearing' block 55 in the tubular bearing member 5G which is threaded into the cross member 8 at the lower end of the burner body. The cover plate 38 and the inner wall bottom member 17 coact to Aform a bearing' chamber 57 for the spindle bearing' 58 which is mounted on a cross piece 59 within the chamber. The cover plate 38 has a central opening 60 alined with the opening- 26 so that a current ofair .is caused to flow through this bearing` chamber preventingl overheatingot the bearing 58.

To further protect the bearing 58 we provide a conical guard 61 havingI a tubular portion 62 enibracine,- the spindle and projecting through the opening 60. thereby more eillectively directing the air across the bearing` 58 and further shielding it from the heat in the combustion chamber.

The tan propeller 63 is mounted upon the spindle within the reduced portion 7 elA the body so that it is subjected to the current ot air which is set up or induced by the draft ot the combustion chamber, and this also causes a current ot air to flow around the lower bearing, thereby preventing` its becom` inc' overbeated. The lower bearing' is provided with a lulnicatingg` connection i-'linto which the lubricant may be introduced. the bearing' having:` a drain opening 65 tor the escape ot excess lubricant. The bearingr 58 is ot selit-lubricaline material and requires no lubrication.

The Yfuel delivered to the atomizing head bv 'fuel nozzles comprising the delivery tubesl (t7 mounted in a downwardly inclined relation. on the couplings lit and the nozzle tubes GS which l are sliding: engpragement with the tubes G7. These nozzles 68 have downwardly directed delivery tips 69.

To prevent the delivery nozzles becoming overhcuted we provide insulating;` or portcrtinc; cases 70 having; enlargements 71 in the upper ends thereot and discharge openings 72 at the lower ends thereof. These enlargements ha ve luns 73 adapted to be engaged between the lugs 13 on the combustion chamber walls for positioning the nozzles, at the same time permittingT the easy removal thereof by pushing; the nozzle inwardly to disengage from the lugs, turning to an inverted position,

and drawing through the openings 12.

In the event of the nozzle tips 69 becoming;r clogged the fuel will back up around the discharge tube into the protective casingr and be discharged through the openings 72. In the event ot the burner becoming extinguished inadvertently or otherwise an excess of fuel being delivered, the fuel drips down upon the cover plate and clearance members into the trough and is discharged through the drain conduit 24 to the receptacle 25 which is provided with a float 7 i controlling a valve for the fuel feed pipe 1G, thereby cutting oil the flow of fuel.

In Fig. I we have, as stated, illustrated our burner as installed in a con'unon type ot hot air furnace, the grate being removed and the burner inserted with a plate 76 en'ibracing the same. The tirepot of the furnace is filled in above this plate with sand or other suitable filler 77 substantially sealing the burner so that air flowing through the furnace is directed through the burner.

We preferably in this connection provide an automatic draft regulator in connection with the smoke iue 78. This comprises a damper plate 79 having an opening 80 therein. The damper 81 is pivoted at 82 to swing downwardly in closing. The damper is provided with a counterbalancing arm 83 threaded to receive the counterweight 84, the hole in the counterweight being preferably eccentrically disposed so that rotation by jarring or vibration is prevented. In use the counterweight is adjusted to normally hold the damper in the desired position to secure the required draft through the burner. Any excess of draft due to atmospheric conditions will cause the damper to open further, thereby maintaining a substantially uniform draft of air through the burner.

By this arrangement of parts a natural draft is set up through the burner, that is no motor air driving or blast fan is required, and when the draft Vregulator is employed the structure is automatic. The damper to the furnace, being suitably controlled, controls the burner.

By avoiding the necessity of motors the liability of the structure becoming inoperative in use is greatly reduced and a more or less noisy element is eliminated. By delivering a quantity of cold air through the central conduit, the amount of cold air being automatically regulated by the draft through the burner which is in turn regulated by the controlling damper, the walls of the combustion chamber are prevented from becoming overheated, and, also, the atomizing head is prevented from becoming` overheated. The balance or proportion of the cold air being once determined remains substantially constant.

Our improved burner requires little attention in use as the atomizing head is automatically driven without the aid of external force or motors requiring power other than that induced by the draft of air. The burner is readily cleaned from any accumulation of carb-ou, dirt or the like and may be easily regulated as desired.

le have illustrated and described our improvements in an embodiment which we have found very practical. We have not attempted to illustrate or describe various modifications or adaptations as we believe this disclosure will enable those skilled in the art to embody our improvements as may be desired.

Ilvaving thus described our invention what we claim as new and desire to secure by Letters Patent is:

l. In an oil burner, the combination of a body open at the bottom for the ingress of air and having a combustion chamber open at the top and bottom disposed centrally therein, an inner wall mounted within said body in spaced relation to the walls thereof and to the wall of said combustion chamber providing a return air passage open at the bottom and surrounding said combustion chamber and delivering to the bottom thereof, an atomizing head disposed within the combustion chamber adjacent the bottom thereof, means for delivering fuel to said head, a spindle for said head, a restricted air delivery conduit open at the bottom and delivering centrally below said atomizing head whereby the combustion chamber walls and head are prevented from becoming overheated and a natural draft secured, and a driving propeller on said spindle disposed in said body below said central air passage to be driven by air passing therethrough.

2, In an oil burner, the combination of a body open at the bottom for the ingress of air and having a combustion chamber open at the top and bottom disposed centrally therein, an inner wall mounted within said body in spaced relation to the walls thereof and to the wall of said combustion chamber providing an air passage open at the bottom and surrounding said combustion chamber and delivering to the bottom thereof, an aton'iizing head rotatably mounted within the combustion chamber, means for delivering fuel to said head, a restricted cold air dcliv ry conduit open at the bottom and delivering' centrally below said. atomizing head wh weby the combustion chamber walls and atomizing' head. are prevented from becoming overhcatcev and a natural draft secured, and a drying propeller on said spindle disposed in said body below said central air passage to be driven by air passing therethrough.

3, In an cil burner, the con'ibination of a bottom body member open at the top and bottom, a top body meml i superimposed thereon and having a conci :ic combustion chamber wall depending from its upper edge providing a combnstion chamber open at the top and bottom, an inner wall bottom member mounted centrally within said bottom body member and having an annular iiange spaced from its side wall providing an annular fuel drain trough. a cover plate resting on said flange of saidy bottoni wall member, an annular shaker member constituting an inter- Cil mediate inner wall member superimposed on said bottom wall member and having a flange with openings therein depending within said bottom wall member so that said openings are closed when the shaker member is in its normal position, said shaker member having spirally disposed supporting lugs thereon, said bottom body member having coacting supports whereby said shaker member is supported for rotary and vertical movement, means for actuating said shaker member, an annular battle wall member superimposed on said shaker member lin concentric relation to said combustion chamber wall and constituting a top inner wall member, said body, combustion chamber wall and inner wall members enacting' to provide a return air passage delivering to the bottom of said combustion chamber, an annular clearing member interposed between said shaker member flange and said cover for independent rotary movement and coacting therewith to provide a cover for said fuel trough permitting the passage of fuel thereto, and a fuel feed means disposed in said Combustion chamber.

fl. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber wall depending from its upper edge providing a combustion chamber open at the top and bottom, an inner wall bottom member mounted centrally within said bottom body member and provided with an annular fuel drain trough, an annular shaker member constituting an intermediate inner wall member superimposed on said bottom wall member for rotary and vertical. movement and lnving a flange with openings therein depending within said bottom wall member so that said openings are closed when the shaker member is in its normal position, means for actuating said shaker member, an annular baille wall member superimposed on said shaker member in concentric relation to said combustion Chamber wall and constituting a top inner wall member, said body, combustion chamber wall and inner wall members eoacting to provide a return air passage delivering to the bottom ol said combustion chamber, a fuel feed means disposed within said combustion chamber, a plate arranged below said fuel feed means to project over said drain trough, and a clearing member interposed between said shaker member flan ge and said coverfplate for independent rotary movement and coacting to provide a cover for said fuel drain trough permitting the passage of fuel thereto.

5. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber wall depending from its upper edge providing a combustion chamber open at the top and bottom, an inner wall bottom member mounted centrally within said bottom body member and provided with an annular fuel drain trough, anv annular shaker member consti tuting an intern'iediate inner wall member superimposed on said bottom wall member for rotary and vertical movement and having a flange with openings therein depending within said bottom wall member so tba 1 said open ings are closed when the shaker member is in its actuating said shaker member, an annular baille Yall member superimposed on said shaker member in concentric relation to said con'ibustion chamber wall and constituting a top inner wall member, said body, combustion chamber wall and inner wall members eoacting to provide ak return air passage deliii'ering to the bottom of said combustion chamber, and a fuel feed means disposed within said combustion chamber.

6. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber wall depending from its upper edge providing a combustion chamber open at the top and bottom, an inner wall bottom member mounted centrally within said bottom body member, an annular shaker member constituting an intermediate inner wall member superimposed on said bottom wall member for rotary and vertical movement and having a flange with openings therein depending within said bottom wall member so that said openings are closed. when the shaker member is in its normal position, mea-ns for actuating said shaker member, an annular baille wall member superimposed on said sha-ker member in concentric relation to said combustion chamber wall and constituting a top inner wall member, said body, combustion chamber wall and inner wall members coacting` to provide a return air passage delivering to the bottom of said combustion chamber, a fuel feed means disposed within said combustion chamber, a conical plate arranged below said combustion chamber, and a clearing member interposed between said shaker member flange and `said plate for independent rotary movement.

7. ln an oil burner, the combination of: a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber wall depending from its upper edge providing a combustion chamber open at the top and bottom, an inner wall bottom member mounted centrally within said bottom body member. an annular shaker member constituting an intermediate inner wall member superimposed on said bottom wall member for rotary and vert-ical movement and having a flange with openings therein depending within said bottom wall member so that said openings are closed when the shaker member is in normal position, means for its `normal position, means for actuating said shaker member, an annular baille Wall member superimposed on said shaker member in concentric relation to said combustion chamwall and constituting a top inner wali member, said body, combustion chamber wall and inner wall members coacting to providel a return air passage delivering to the bottom of said combustion chamber. a fuel feed means disposed within said combustion chamber, and a conical plate arranged below said combustion chamber 8. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber wall depending from its upper edge providing a chamber open at the top and bottom, an inner Wall comprising a bottom member having a central restricted opening therein and provided with an annular fuel trough, an intermediate member mounted on said bottom member for rotative and vertical movement and having openings therein associated with said bottom member so that they are normally closed, and a top member mounted on said intermediate member to permit independent rotative movement of such intermediate member, a cover plate mounted on said bottom inner wall member and coacting therewith to provide a bearing chamber, an annular fuel trough cover member operatively associated with said cover plate and intermediate wall member for independent rotativo movement, an atomizing head disposed within said combustion chamber, a spindle therefor arranged through said bearing member and provided with a bearing therein, a propeller arranged on said spindle within said bottom body member and below said inner wall bottom member, a nozzle arranged to deliver above said atomizing head, said combustion chamber and top inner Wall member having openings to receive said nozzle, and fuel supply connections for said nozzle disposed within said top body member.

9. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber Wall depending from its upper edge providing a chamber open at the top and bottom, an inner Wall comprising a bottom member having a central restricted opening therein and provided with an annular fuel trough, intermediate member mounted on said bottoni member for rotative and vertical movement and having openings therein associated with said bottom member so that they are normally closed, and a top member mounted on said intermediate member to permit independent rotative movement of such intermediate member, an atomizing head disposed within said combustion chamber, a spindle therefor arranged through said bottom member and provided with a bearing therein, a propeller arranged on said spindle within said bottom body member and below said inner wall bottom member, a nozzle arranged to deliver above said atomizing head, said combustion chamber and top inner wall member having openings to receive said nozzle, and fuel supply connections for said nozzle disposed Within said top body member.

l0. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber Walldepending from its upper edge providing a chamber open at the top and bottom, an inner Wall comprising a bottom member having a central restricted opening therein and provided with an annular fuel trough, an intermediate member mounted on said bottom member for rotative and verticalk movement and having openings therein associated with said bottom member' so that they are normally closed, and a top member mounted on said intermediate member to permit independent rotative movement of such intermediate member, a cover plate mounted on said bottom inner Wall member and coacting therewith to provide a bearing chamber, an annular fuel trough cover member operatively associated with said cover plate and intermediate wall member for independent rotative movement, and a fuel feed means disposed in said combustion chamber.

ll. In an oil burner, the combination of a bottom body member open at the top and bottom, a top body member superimposed thereon and having a concentric combustion chamber wall depending from its upper edge providing a chamber open at the top and bottom, an inner wall comprising a bottom member having a central restricted opening therein and provided with an annular fuel trough, an intermediate member mounted on said bottom member for rotative and vertical movement and having openings therein associated with said bottom member so that they are normally closed and atop member mounted on said intermediate member to permit independent rotative movement of such intermediate member, and a fuel feed means disposed in said combustion chamber.

l2. In an oil burner, the combination of a body open at the bottom and having' a combustion chamber open at the top and bottom, an inner wall mounted within said body in spaced relation to the Walls thereof and with its upper end projecting above the lower edge of the combustion chamber wall providing a return air passage delivering to the bottom of the combustion chamber, said inner wall having a bottom portion with a central restricted opening therein, a bearing chamber within said inner wall having a restricted opening in the top thereof, an atomizing head disposed within said combustion chamber llt) above the plane of its lower edge, a spindle therefor provided with a bearing arranged in said bearingchamber, a propeller arranged on said spindle at the lower end ot said body to be driven by rthe air passing therethrough, a nozzle delivering to said atomizing head, and a conical-guard disposed in said bearing chamber above said bearing and having a tubular portion projecting through the open- .ing at the upper end of the bearing chamber.

13. ln an oil burner, the combination oit' a body open at the bottom and having a combastion chamber open at the top and bottom, an inner wall mounted within said body in spaced relation to the walls thereoit and with its upper end projecting above the lower edge of the combustion chamber wall providing'a return air passage delivering to the bottom ot' the combustion chamber, said inner wall having a bottom portion with a central restricted opening therein, a bearing chamber within said inner wall having a restricted opening in the top thereof, an atomized head disposed within said combustion chamber above the plane of its lower edge, a spindle therefor provided with a bearing arranged in said bearing chamber, a propeller arranged on said spindle at the lower end of said body to be driven by the air passing therethrough, and a nozzle delivering to said atomizing head.

14:. In an oil burner, the combination of a bottom member open at the bottom and having a concentric combustion chamber wall depending from its upper edge providing a combustion chamber open at the top and bottom, an inner wall disposed within said body in spaced relation to the walls thereol and with its upper end projecting above the combustion chamber in concentric :relation thereto providing a return air passage delivering to the bottom of the combustion cham'- ber, there being a bearing chamber within said inner wall having restricted air passages at the top and bottom thereof, an atomizingl head disposed within said combustion cnamber above the plane ot its lower edge, and a spindle there'lor provided with a bearing within said bearing chamber and with a propeller disposed below said bearing chamber to be driven by the air passing thereto, said spindle having a bearing positioned in the air passage below said propeller.

l5. In an oil burner, the combination ot a body open at the bottom and having a combustion chamber open at the top and bottom disposed centrally therein, an inner wail mounted within said body in spaced relation to the walls thereolf and with its upper end embracing the combustion chamber providing a return air passage delivering to the bottom ol the combustion chamber, a bearing chamber within said inner Wall having a restrieted'air opening at the bottom and top thereof, an atomizing head disposed within said combustion chamber, a spindle therefor provided with a bearing arranged in said bearing chamber, a propeller arranged on said'spindle within the lower end of said body to be driven by the air passing therethrough, a nozzle delivering to said atomi'zing head, and a coni al guard disposed in said bearing chamber above said bearing and having a tubular portion projecting through the opening at the upper end of the bearing chamber.

i6. In an oil burner, the combination ot' a body open at the bottom and having a combustion chamber open at the top and bottom disposed centrally therein, an inner wall mounted within said body in spaced relation to the walls thereof and with its upper end embracing the combustion chamber providing a return air passage delivering to the bottom of the combustion chamber, a bearing chamber within said inner wall having a restricted air opening at the bottom and top thereot, an atomizing head disposed within said combustion chamber, a spindle therefor provided with a bearing arranged in said bearing chamber, a propeller arranged on said spindle within the lower end olf said body to be driven by the air passing therethrough, and a nozzle delivering to said atomizing head.

17. In an oil burner, the combination of a body open at the bottom and having a combustion chamber open at the top and bottom disposed centrally therein, an inner wall mounted within said body in spaced relation to the walls thereof providing an air passage delivering to the bottom of the comn bustion chamber, a bearing chamber within said inner wall having a restricted air opening at the bottom and top thereof, an atomizing head disposed within said combustion chamber, a spindle therefor pro-I vided with a bearing arranged in said-bearing chamber and with a bearing at the low r end of said body, and a nozzle delivering to said atomizing head.

18. In an oil burner, the combination ot a body open at the bottom and having a combustion chamber disposed centrally at its upper end, said combustion chamber being open at the top and bottom, an inner wall disposed within said body in spaced relation to the walls thereof and with its upper end in a concentric relation to said combustion chamber providing a return air passage delivering to the bottom oi said combustion chamber, a centrally disposed bearing chamber having restricted air openings at the top and bottom thereoli, an atomizing head disposed within said combustion chamber, a spindle therefor provided with a bearing arranged in said bearing chamber and with a` second bearing at the lower end ot said body whereby a flow ot air is secured around said bearings, a propeller arranged on said spindle below lill) said bearing chamber to be driven by the draft of air Within said burner body, and a nozzle delivering to said atomizing head.

19. In an oil burner, the combination of a body open at the bottom and having a combustion chamber disposed centrally therein, said combustion chamber being open at the top and bottom, an inner Wall disposed with-- in said body in spaced relation to the walls thereof and with its upper end embracing the said combustion chamber providing a return air passage delivering to the bottom of the combustion chamber, an atomizing head disposed Within said combustion chamber above the plane of the bottom thereof, a fuel nozzle delivering to said atomizing head, a spindle for said atomizing head provided with a bearing arranged adjacent to but below said atomizing head, a guard for said bearing having a tubular portion embracing said spindle, a propeller on said spindle, and means for b -passing a portion of the air at a point a ove said propeller through said bearing guard.

20. In an oil burner, the combination of a body member open at the bottom forthe ingress of air, a combustion chamber disposed centrally within said body, said combustion chamber being open at the top and bottom, an inner Wall disposed Within said body in spaced relation to said combustion chamber and body walls providing an air passage delivering to the bottom of said combustion chamber, an atomizing head comprising an annular atomizing plate provided With fan blades, a rim disposed to embrace said atomizin plate and adjacent to said combustion cIiamber walls, a baliie plate disposed above and in spaced relation to said atomizing plate, a nozzle arranged to delivei` to s aid atomizing plate, a spindle for said atomizing head, and a blade propeller mounted on .said spindle within said air passage to be driven by the draft of air therethrough..

2l. In an oil burner, the combination of a body member open at the bottom for the in gress of air, a combustion chamber disposed centrally Within said body, said combustion chamber being open at the top and bottom, an inner Wall disposed Within said body in spaced relation to said combustion chamber and body Walls providing an air passage delivering to the bottom of said cpmbustion chamber, a rotatably mounted atomizing head comprising an annular atomizing plate provided with fan blades. a rim disposed to embrace said atomizing plate and adjacent to said combustion chamber Walls, a baile plate disposed above and in spaced relation to said atomizing plate, and a nozzle arranged to deliver to said atomizing plate.

22. In an oil burner, the combination of a body open at the bottom and having a combustion chamber disposed centrally therein, said combustion chamber being open at the top and bottom, an inner wall disposed With-- in said body in spaced relation to the Walls thereof and with its upper end disposed in concentric relation to said combustion cham* bei' providing a return air passage delivering to the bot-tom of the combustion chamber, said combustion chamber and inner Walls having` alined openings therein, an atomizing head comprising a top plate, radial arms mounted thereon in a plane below said top plate, an annular rim disposed on the outer ends of said arms, an annular atomizing plate disposed on said arms and provided with fan blades lying within the plane of said rim, and a fuel nozzle arranged through said openings in said Walls to deliver upon' said atomizing plate.

In an oil burner, the combination of a body open at the bottom and having a combustion chamber disposed centrally therein, said combustion chamber being open at the top and bottom, an inner Wall disposed Within said body in spaced relation t-o the Walls thereof and With its upper end disposed in concentric relation to said combustion chamber providing a return air passage delivering to the bottom of the combustion chamber, an atomizing head comprising a top plate, ra'- dial arms mounted thereon in a plane below said top plate, an annular rim disposed on the outer ends of said arms, an annular atomizing plate disposed on said arms and provided with fan blades lying within the plane of said rim, and a fuel nozzle arranged to deliver upon said atomizing plate.

24. In an oil burner, the combination of a combustion chamber open at the top and bottoni, an atomizing head rotatably mounted Within said combustion chamber and comprising a centrally disposed battle plate, radial arms projecting beyond said baille plate in a plane below the same, an annular rim mounted on said arms, an annular atomiziiig plate disposed on said arms Within said riiu and provided with fan blades, and means for delivering liquid fuel upon said atomizing plate.

In an oil burner, the combination of a body open at the bottom and havinga concentrically disposed combustion chamber Wall depending from the top providing a combustion chamber open at the top and bottom, an inner Wall mounted Within said body in. concentric relation to the Walls thereof and ef said combustion chamber Wall providing a return air passage delivering to the bottone of the combustion chamber, an atomiziiig head rotatably mounted in said combustion chamber, a fuel nozzle comprising a doWnivardly inclined delivery tube, a tubular nozzle member slidably mounted thereon and having' a downwardly directed delivery tip, a tubular casing embracing said nozzle member and having an enlargement at its upper end slidable on said delivery tube providing llO an outer protecting easing and an overflow passage, Said easing having zr discharge openinnr at its inner end, seid combustion Chamber and inner Wall having; :xlined openings therein to receive Suid nozzle :ind permit its sliding;f engagement, with :mid delivery tulle, smid eeeingr enlargementhzwing .fr positioning' lug' thereon eonetingf With poeitioning; lugs on said eonihuetion elnunher well.

QG. In oil limi-ner. the eoinliiinition o'f n hodr open :it the hottom :ind having` n eoncent1'ienllg7 diepoeed oomhuetion elizimher m ll depending from the top inovidingr :1 eenihuetion ehfnnlier open et the top :ind bottoni, :in inner Wall mounted Within Suid body in eoneentrie relation to the Welle thereof and of Seid combustion elniniber Wall providingr a` return air passage delivering to the bottom of the Combustion chamber, an atomizing heed rotatably mounted in said combustion eheniherr, e. 't'uel nozzle comprising a doWn mlraliy nelined delivery tuhe, a tubular nozzle member slidably mounted thereon, :1 tubular eeeing embracing' Seid nozzle memliee-i providing an outer protectingr Casing sind un overflow passage, said casing' disehergre Hiring; e discharge opening et its inner end, seid combustion elieinber and inner Well having; elined openings therein to receive Seid nozzle and permit its sliding engagement With Said delivery tuhe.

Vin Witness whereof we here hereunto set our hands.

EDU/YARD A. FIELD. EDVARD A. FIELD, Jn. 

